NEW YORK San Antonio Spurs forward Stephen Jackson has been fined $25,000 by the NBA for threatening Oklahoma City's Serge Ibaka in a Twitter post.

Jackson reportedly posted the message after Ibaka and Los Angeles Lakers forward Metta World Peace got tied up during the fourth quarter of the Thunder's 114-108 victory on Friday night. (Scroll down to watch the play).

Jackson and World Peace are former teammates in Indiana.

CBSSports.com's Royce Young reports that Jackson wrote: "Somebody tell serg Abaka. He aint bout dis life. Next time he run up on me im goin in his mouth. That's a promise. He doin 2 much."

The post has been deleted and Jackson issued an apology on his Twitter account, writing: writing, "I apologize to @SergeIbaka, the NBA, and to all my fans for the comments I made. It was unprofessional and childish. I'm not a thug just a man who speaks his mind. It was not appropriate. I do apologize. Only a man can admit when he's wrong."

The league announced the fine on Sunday night.

"The recent public comments made by Stephen Jackson are absolutely unacceptable, cannot be tolerated and do not reflect the standards held by the San Antonio Spurs," Spurs general manager RC Buford said Sunday night in an emailed statement.

Asked about Jackson's comments Sunday, Ibaka had no reaction.

"I don't want to talk about it right now," Ibaka said. "I didn't see nothing, I didn't hear nothing."